Takes a git repo with expected branches 'base' and 'master' and produces a patch for /usr/src/files/path-REPO

generate-patch.sh

#! /bin/sh

DEST_DIR=$(realpath $1)

for git_repo in *; do
  if ! [ -d "${git_repo}/.git" ]; then
    continue
  fi
 PREFIX="./${git_repo//-//}"
 pushd $git_repo > /dev/null
 echo $git_repo
 git checkout master > /dev/null 2>&1

 rm -f "${DEST_DIR}/patch-${git_repo}"
 touch "${DEST_DIR}/patch-${git_repo}"

 echo "Summary:" >> "${DEST_DIR}/patch-${git_repo}"
 git diff --stat base..master >> "${DEST_DIR}/patch-${git_repo}"
 echo "----" >> "${DEST_DIR}/patch-${git_repo}"
 echo "" >> "${DEST_DIR}/patch-${git_repo}"
 echo "" >> "${DEST_DIR}/patch-${git_repo}"

 echo "Files modified:" >> "${DEST_DIR}/patch-${git_repo}"
 git log --stat base..master >> "${DEST_DIR}/patch-${git_repo}"
 echo "----" >> "${DEST_DIR}/patch-${git_repo}"
 echo "" >> "${DEST_DIR}/patch-${git_repo}"
 echo "" >> "${DEST_DIR}/patch-${git_repo}"

 git diff --src-prefix="${PREFIX}.orig/" --dst-prefix="${PREFIX}/" base..master >> "${DEST_DIR}/patch-${git_repo}"
 popd > /dev/null
done